Inner tubular support for pneumatic tires.



J. T. LISTER. SUPPORT FO'R PNEUMATIC Patented Jan. 21, 1919.

JOHN '.i. LSTJR, DI" NEAR WELIINGTON, OHIO.

INNER TUBULAR SUPPORT FOB PNEUMTIC TIRES.

metete.

Application led July 26. 191.8.

Be it known that I, .,lonN 'l`. lns'rnn. a eitizen of the'linitedStates. residing near ll'elling'ton, in the eount otl liorain and 4Stateot' Ohio, have invented a eertain new and useful Improvement in lnner'tubular Supports for Pneumatic ylires. ot" whieh the 'followingl in at'ull, clear. and exaet deseription.

This invention relates to an inner tubular support for pneuinatie tires,sueb ait-mre eoininonly employed on motor driven 'veliielesz It is theprincipal objeet of this invention to provide a strong and durable.pneuniatie tubularsupport which is designed to be inelosed in theordinary easing or tire shoe. in tbe Same manner that the thin rubberinner tube is now employed. More speeitieall)Y eonsid ered, iat is theaim of the invention to provide in inner endlesstubular-support designed'to be filled (with air, butwhieh is less suseeptible, to piincturing`and blow outs and has longer lite than the ordinari,y inner tub'e.

In accordance witlriny invention. they inner tubular support of the tireis molded from unvuleanized rubber in two seetions, each eup shaped incross .seetioin and eirrular in torni. and otl ani' desired tbiekness,the latter preterabl)v exeeeding the thiekness of the thin inner tubenow employed. To torni the eoinpleted artiele. the two ball seetions areu'ited along their circular edges by being placed one over the other,utilizing' if neeessary a eeinenting;r agency. such as rubber eenient,and they are then vuleaniz/.ed togrether so as to t'orni a tubularsupport` ot eonsiderable strength and resistance to puni:- turing wbiehis ot uni'torni thieltness at all points, and inherently or naturallycircular 1n t'orxn. so that when it is inserted in the,

outer easinpr and intiated through a'suitable air valve all parts willbe otsubstantiallv uniform tbieltness, and under substantially uniformtension.

Preferably the edges of tbe two molded halves are'niade irregular, suebas ot' undulatine forni., so as to add to the strength ot the tube whenthe parte` are joined and vulefziiiizet'i.

The invention maybe further brietty sun1- niarized as consisting inertain novel details ot emistruetionand ebaraeteristies of the innertubular tire support as will be described in the speeitiation and setforth in the apl pended elanns.

ln the accompanying sheet of drawings,

Specification of Letters Patent.

nannten Jaa. 2i. ons.

Serial No. 246.807.

Figure l is a rross seetioual view through a tubular support ot' a tiremade in aeeordauee with one `t'orui not' tbe invention; Fig. is asimilar view .showing-a nioditieation liii tbe loeatiou ot tbe liointswhere tbe two molded halves are united: Fiji. It is a fragmentary .sideview' on a redueed seule ot' the tire support shown in Fig'. I.; andFigi. l is a t'ran'nu-.itary tread view ottbe tire sup` port shown inFig. 2. lilte'wise on a 'redueed seale.

l'he inner tubular tire support ot Figs; lv and il is torined in twoparts` [')i'elferably baltI sections lt) and 11 eaeb substanti,a`ll

seinieireular in eross seetion at any point,

plastie unvuleanij/,odrub llh' and blow outs. 'ben the sections l() and.i

l1 are l'ornied they are placed togetberone on the other` with theirsiniilar edges nnitehinflA and as'betore stated rubber eenient. or othersuitable ee1nentin; agency maybe utilized to assist in forming a tipgbt.strong, air tight joint. 'l`ben theyv are vuleanized in a suitablevuleauizinn lnold. a eertain degree of inflation beine' utilized duringruleaniz/.ation it' tbe saine. is tound necessary to t'oree, the rubberout against the eireular wall ot" the inold. suitable valve stein 12' isprovided in the seetion l1 i'or inflation during` vuleanization, andalter tbe tire is eoinpleted and ready 'for use in theI tire easing.

' in the Vt'orni shown in Fig'. 1` the joints where the. two halves ot'the tubular supporty are united are shown at lll and ll, thesel jointsbeine; on diainetriea'lly opposite sides ot` the tire .support in a zonemidway be.- tween tbe inner and outer peripberies ot' the artiele..\ddit.ionall as will be observed, tbe. edges ot tbe molded halt'sections are made irregular, in this ease ot corrugated or undulatiin;rt'orni` and when the two seotions are plaeed together the undulationsintertit and the other at the inner periphery of they tuhular support.Otherwise the article ot' Figs. 2 and 4 is similar to that ot' Figs. 1and 3. the edges of the section being` ot' undulating shape. and bothsections beiner originally molded ot unvuleanized rubber into thecircular trough shape and being united and subsequentlyv vulcanizedtogether in the manner first explained.

The tubular member above explained either formed as shown in Figs. l"and il or as in Figs. i2 and l. when inserted in the tire casing" andinflated with the desired degree of pressure. a'ti'ords the necessary ordesired resiliency. but lnvertheless it has longer lit'e than anordinary inner tube and is less easilyY punctured. and is not sosusceptible to a blow out should the tire cas-iner be weakened as whenan ordinary thin inner tube is e111- ployed.

lt will he undcrstoothof course, that in moldingthe tubular support intwo halvesi which are subsequently united in the manner explained, thedifliculties in removingr a core about which each haltI is molded is notein-ountered. as is the case when it is attempted to mold an inner'tubeor tubular support as a complete unit or in the torin of a completecircle transversely considered.`

It will be understood also that by reason sections molded from plasticunrulcanized rubber joined at their circumierential edges and vul'anizedtogether.

A. hollow rubber inner tubular support for pneumatic tire Aasingsconsi.'stin oit two sections cach molded from plastic unvulcanizedrubber into an endless piece substantially semicircular in cross sectionand joined together at their edges and vulcanized.

3. hollow rubber inner tubular support tor pneumatic tire casincsconsistingY ot' two sections molded into annular cup shaped form t'romunvulcanized rubber and joined togethe' at their edges and vulcanized.the adjoining'edges being ot irregular form.

In testimony whereof. l hereunto atliX my signature.

JOHN T. LISTINI.

